2004 GMC Envoy Owner's Manual - Page 424

Additional Required Services The following services should be performed at the first maintenance service (I or II) after the indicated miles (kilometers) shown for each item. Additional Required Services Service and Miles (Kilometers) Inspect fuel system for damage or leaks. Inspect exhaust system for loose or damaged components. Replace fuel filter. An Emission Control Service. See footnote †. Replace engine air cleaner filter. See Engine Air Cleaner/Filter on page 5-21. An Emission Control Service. Change automatic transmission fluid and filter (severe service). See footnote (h). 25,000 (41 500 50,000 (83 000 75,000 (125 000 100,000 (166 000 125,000 (207 500 150,000 (240 000 • • • • • • • • • 6-6